作者asynchronous (同步)
看板Math
標題[幾何] vector field
時間Tue Jul 12 00:09:52 2011
S is a surface, F is a vector field in R^3
if F is constant on S, and F˙n = 0 on S (n is the normal vector of S)
is it necessary that ▽˙F = 0 on S ?
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